.banner_live{
    width:100%;
    height: 70px;
    background: #fff;
    text-align: center;
    line-height: 70px; 
    font-size:26px;
}

.main>ul{
    width:100%;
    overflow: hidden;
}

.main>ul li{
    float: left;
    width: 25%;
    position: relative;

}


.main>ul li a{
    text-decoration: none;
    
}
.main_more{
    display: inline-block;
    padding:10px 20px;
    background: #6dc3f4;
    color:#000;
    margin-top:10px;
    position: relative;
    overflow: hidden;
    z-index: 3;
}
/*

 width,height 100%是包括padding的 
 main_more_hide层级必须最低 
 main_more层级最高
 父级.main>ul li>div中间层级

*/
.main_more .main_more_hide{
    /*display: block;*/
    width:100%;
    height: 100%;
    position:absolute;
    background:#fff;
    top:100%;
    left:0;
    z-index: -1;
}



.main>ul li img{
    width: 100%;
    vertical-align: middle;
}

.main>ul li h3{
    color:#6dc3f4;
}

.main>ul li>div{
    position: absolute;
    bottom:30px;
    left:30px;
    z-index: 2;
}

.main>ul li>div h1>a{
    color:#fff;
    font-size: 28px;
}

.main .main_bottom{
    width: 100%;
    height: 50px;
    position: relative;
    background: #fff;
}

.main .main_bottom button{
    padding: 10px 20px;
    color:#fff;
    background: #393d43;
    margin:0 auto;
    text-decoration: none;
    position: absolute;
    left:50%;
    bottom:0;
    transform:translateX(-50%);
    -webkit-transform:translateX(-50%);
    -moz-transform:translateX(-50%);
    -ms-transform:translateX(-50%);
    border:none;
    cursor: pointer;
    outline: none;
    font-size: 18px;
}

nav ul:last-child li:nth-child(2){
    background:#000912;
}   

nav ul:last-child li:nth-child(2) a{
    color:#fff;
}

@media (max-width: 1366px){
    .main>ul li{
        width:33.33%;
    }

}

@media (max-width: 768px){
    .main>ul li{
        width:50%;
    }

    .main .main_bottom button{
        display: block;
        width: 100%;
    }
}

@media (max-width: 540px){
    .main>ul li{
        width:100%;
    }


}